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+ <section id="local-authorization-interface-localauth">
+<span id="localauth-plugin"></span><h1>Local authorization interface (localauth)<a class="headerlink" href="#local-authorization-interface-localauth" title="Permalink to this headline">¶</a></h1>
+<p>The localauth interface was first introduced in release 1.12. It
+allows modules to control the relationship between Kerberos principals
+and local system accounts. When an application calls
+<a class="reference internal" href="../appdev/refs/api/krb5_kuserok.html#c.krb5_kuserok" title="krb5_kuserok"><code class="xref c c-func docutils literal notranslate"><span class="pre">krb5_kuserok()</span></code></a> or <a class="reference internal" href="../appdev/refs/api/krb5_aname_to_localname.html#c.krb5_aname_to_localname" title="krb5_aname_to_localname"><code class="xref c c-func docutils literal notranslate"><span class="pre">krb5_aname_to_localname()</span></code></a>, localauth
+modules are consulted to determine the result. For a detailed
+description of the localauth interface, see the header file
+<code class="docutils literal notranslate"><span class="pre">&lt;krb5/localauth_plugin.h&gt;</span></code>.</p>
+<p>A module can create and destroy per-library-context state objects
+using the <strong>init</strong> and <strong>fini</strong> methods. If the module does not need
+any state, it does not need to implement these methods.</p>
+<p>The optional <strong>userok</strong> method allows a module to control the behavior
+of <a class="reference internal" href="../appdev/refs/api/krb5_kuserok.html#c.krb5_kuserok" title="krb5_kuserok"><code class="xref c c-func docutils literal notranslate"><span class="pre">krb5_kuserok()</span></code></a>. The module receives the authenticated name
+and the local account name as inputs, and can return either 0 to
+authorize access, KRB5_PLUGIN_NO_HANDLE to defer the decision to other
+modules, or another error (canonically EPERM) to authoritatively deny
+access. Access is granted if at least one module grants access and no
+module authoritatively denies access.</p>
+<p>The optional <strong>an2ln</strong> method can work in two different ways. If the
+module sets an array of uppercase type names in <strong>an2ln_types</strong>, then
+the module’s <strong>an2ln</strong> method will only be invoked by
+<a class="reference internal" href="../appdev/refs/api/krb5_aname_to_localname.html#c.krb5_aname_to_localname" title="krb5_aname_to_localname"><code class="xref c c-func docutils literal notranslate"><span class="pre">krb5_aname_to_localname()</span></code></a> if an <strong>auth_to_local</strong> value in
+<a class="reference internal" href="../admin/conf_files/krb5_conf.html#krb5-conf-5"><span class="std std-ref">krb5.conf</span></a> refers to one of the module’s types. In this
+case, the <em>type</em> and <em>residual</em> arguments will give the type name and
+residual string of the <strong>auth_to_local</strong> value.</p>
+<p>If the module does not set <strong>an2ln_types</strong> but does implement
+<strong>an2ln</strong>, the module’s <strong>an2ln</strong> method will be invoked for all
+<a class="reference internal" href="../appdev/refs/api/krb5_aname_to_localname.html#c.krb5_aname_to_localname" title="krb5_aname_to_localname"><code class="xref c c-func docutils literal notranslate"><span class="pre">krb5_aname_to_localname()</span></code></a> operations unless an earlier module
+determines a mapping, with <em>type</em> and <em>residual</em> set to NULL. The
+module can return KRB5_LNAME_NO_TRANS to defer mapping to later
+modules.</p>
+<p>If a module implements <strong>an2ln</strong>, it must also implement
+<strong>free_string</strong> to ensure that memory is allocated and deallocated
+consistently.</p>
+</section>
+
+
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+ </div>
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+ <div class="sidebar">
+
+ <h2>On this page</h2>
+ <ul>
+<li><a class="reference internal" href="#">Local authorization interface (localauth)</a></li>
+</ul>
+
+ <br/>
+ <h2>Table of contents</h2>
+ <ul class="current">
+<li class="toctree-l1"><a class="reference internal" href="../user/index.html">For users</a></li>
+<li class="toctree-l1"><a class="reference internal" href="../admin/index.html">For administrators</a></li>
+<li class="toctree-l1"><a class="reference internal" href="../appdev/index.html">For application developers</a></li>
+<li class="toctree-l1 current"><a class="reference internal" href="index.html">For plugin module developers</a><ul class="current">
+<li class="toctree-l2"><a class="reference internal" href="general.html">General plugin concepts</a></li>
+<li class="toctree-l2"><a class="reference internal" href="clpreauth.html">Client preauthentication interface (clpreauth)</a></li>
+<li class="toctree-l2"><a class="reference internal" href="kdcpreauth.html">KDC preauthentication interface (kdcpreauth)</a></li>
+<li class="toctree-l2"><a class="reference internal" href="ccselect.html">Credential cache selection interface (ccselect)</a></li>
+<li class="toctree-l2"><a class="reference internal" href="pwqual.html">Password quality interface (pwqual)</a></li>
+<li class="toctree-l2"><a class="reference internal" href="kadm5_hook.html">KADM5 hook interface (kadm5_hook)</a></li>
+<li class="toctree-l2"><a class="reference internal" href="kadm5_auth.html">kadmin authorization interface (kadm5_auth)</a></li>
+<li class="toctree-l2"><a class="reference internal" href="hostrealm.html">Host-to-realm interface (hostrealm)</a></li>
+<li class="toctree-l2 current"><a class="current reference internal" href="#">Local authorization interface (localauth)</a></li>
+<li class="toctree-l2"><a class="reference internal" href="locate.html">Server location interface (locate)</a></li>
+<li class="toctree-l2"><a class="reference internal" href="profile.html">Configuration interface (profile)</a></li>
+<li class="toctree-l2"><a class="reference internal" href="gssapi.html">GSSAPI mechanism interface</a></li>
+<li class="toctree-l2"><a class="reference internal" href="internal.html">Internal pluggable interfaces</a></li>
+<li class="toctree-l2"><a class="reference internal" href="certauth.html">PKINIT certificate authorization interface (certauth)</a></li>
+<li class="toctree-l2"><a class="reference internal" href="kdcpolicy.html">KDC policy interface (kdcpolicy)</a></li>
+</ul>
+</li>
+<li class="toctree-l1"><a class="reference internal" href="../build/index.html">Building Kerberos V5</a></li>
+<li class="toctree-l1"><a class="reference internal" href="../basic/index.html">Kerberos V5 concepts</a></li>
+<li class="toctree-l1"><a class="reference internal" href="../formats/index.html">Protocols and file formats</a></li>
+<li class="toctree-l1"><a class="reference internal" href="../mitK5features.html">MIT Kerberos features</a></li>
+<li class="toctree-l1"><a class="reference internal" href="../build_this.html">How to build this documentation from the source</a></li>
+<li class="toctree-l1"><a class="reference internal" href="../about.html">Contributing to the MIT Kerberos Documentation</a></li>
+<li class="toctree-l1"><a class="reference internal" href="../resources.html">Resources</a></li>
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